Adjustable bubble level



FIG. 1 is a front view of the adjustable bubble level.

FIG. 2 is a rear view of the claimed design.

FIG. 3 is a left side view of the claimed design.

FIG. 4 is a top view of the claimed design.

FIG. 5 is a perspective view of the claimed design; and,

FIG. 6 is a front detail view of the claimed design. 

CLAIM I claim the ornamental design for an adjustable bubble level, as shown and described. 